K.L. and B.J Kosanke
Fire sculptures are not a true pyrotechnic effect, being produced simply by the burning of a liquid fuel in air. Nonetheless their use can contribute rather nicely to firework displays that include ground effects. Fire sculptures form continuous images in yellow fire that burn for 10 minutes or more. This is in contrast to lance work images, created using a series of points of variously colored fire that burn for about a minute. As with lance work, it is probably more common for fire sculptures to form images of objects, ships or buildings, than lettering such as in the (self-serving) example below.
Ref: Selected Pyrotechnic Publication of K.L. and B.J Kosanke, Part 6, (2001-2002), pp 1-2
© Journal of Pyrotechnics and CarnDu Ltd